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[WARNING: Jailbreakers should NOT upgrade to iOS 5.1 until a corresponding jailbreak is released)

In what amounted to the first formal announcement at Apple's media event today, Tim Cook revealed that iOS 5.1 (for iPhone, iPad and iPod touch) is now available for OTA download.

In addition to addressing bugs affecting battery life, the 189MB update delivers a number of significant tweaks and improvements. Most notably, there's voice dictation support for the iPad, an updated Camera app, and the ability to delete photos from Photo Stream.